June 24, 1916

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Features

Rock Tunneling Without the Use of Explosives, What the War has Taught American Industries, and more

The Spruce Gum Industry

An Important Article of Commerce from the Northern Woods

By Samuel J. Record

Strategic Moves of the War, June 15th, 1916

Our Military Expert

A Model Hospital Train

Describing the Completeness of the Bavarian State Hospital Train

By Alfred Gradenwitz

Newspapers that are Printed Within Gun Range of the Enemy

Trench journals from French soldier-journalists.

By Jacques Boyer

The Flying Sensation

Could it be Realized?

By C. Dienstbach

Departments

Departments

Correspondence - June 24, 1916

Inventions New and Interesting - June 24, 1916

Recently Patented Inventions - June 24, 1916

Notes and Queries

Index

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